2001 Oldsmobile Alero

Engine Performance problem
2001 Oldsmobile Alero 4 cyl Front Wheel Drive Automatic 179, 90 miles

the car started to run rough. It seem like it had no power at take off and that I could be running on only three cylinders. I had the car hook up to a diagnostic computer and it confirmed there was a misfire one cylinder #1. We changed the spark plugs and an igition coil. It still running as if its running on three cyliders. What else could be wrong with it that we would need to change? Could it be the ingition coil housing itself?
February 12, 2010.

Check the fuel injector and compression on #1 cylinder.

Feb 13, 2010.